Variable magnification optical system for projection and projection-type display apparatus
a technology of optical system and magnification, applied in the field of variable magnification optical system for projection and projection-type display apparatus, can solve the problem of inability to maintain excellent projection performance, and achieve the effect of wide angle of view, low price and small siz
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example 1
[0096]FIG. 1 is a diagram illustrating the lens structure of a variable magnification optical system for projection in Example 1. Since FIG. 1 has been described already, repetition of explanation will he omitted.
[0097]The variable magnification optical system for projection in Example 1 is a zoom lens consisting of two lens groups of negative lens group GN having negative refractive power and positive lens group GP having positive refractive power in this order from the magnification side. Negative lens group GN moves toward the reduction side, and positive lens group GP moves toward the magnification side during magnification change.
[0098]Negative lens group GN consists of first lens L1 having negative meniscus shape with its convex surface facing the reduction side in a paraxial region and second lens L2, which is a biconcave lens, in this order from the magnification side. Further, positive lens group GP consists of third lens L3, which is a biconvex lens, fourth lens L4. Which ...
example 2
[0114]FIG. 2 illustrates the lens structure of the variable magnification optical system for projection in Example 2. The variable magnification optical system for projection in Example 2 has substantially similar structure to the variable magnification optical system for projection in Example 1.
[0115]Table 4, Table 5 and Table to show basic lens data on the variable magnification optical system for projection in Example 2, specification and variable surface distances, and aspherical surface coefficients, respectively. FIG. 8. Sections A through L, FIG. 9, Sections A through I, FIG. 10, Sections A through I and FIG. 11. Sections A through I illustrate aberration diagrams of the variable magnification optical system for projection in Example 2.
TABLE 4EXAMPLE 2 BASIC LENS DATASiRiDiNdjνdj*1−19.2442.7291.4902357.45*2−20.3951.4643−72.5001.0911.6204160.29419.092DD[4]525.2043.4111.7129953.876−80.7310.273711.6283.4111.7725049.60836.0682.8039−26.3322.3871.8051825.42108.2930.6561116.7393.410...
example 3
[0116]FIG. 3 is a diagram illustrating the lens structure of the variable magnification optical system for projection in Example 3. The variable magnification optical system for projection in Example 3 consists of negative lens group GN having negative refractive power and positive lens group GP having positive refractive power arranged in this order from the magnification side. Further, positive lens group GP consists of front group GPf having positive refractive power and rear group GPr having positive refractive power in this order from the magnification side. The variable magnification optical system for projection in Example 3 is a zoom lens of three group structure in which each of three lens groups of negative lens group GN, front group GPf and rear group GPr moves during magnification change. Negative lens group GN moves toward the reduction side, and front group GPf and rear group GPr move toward the magnification side during magnification change.
[0117]Negative lens group G...
PUM
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